Selective entrainment of sediment graded by size and density under waves

Tomkins, M.R., Nielsen, P. and Hughes, M.G. (2003) Selective entrainment of sediment graded by size and density under waves. Journal of Sedimentary Research, 73 6: 906-911. doi:10.1306/031703730906

Author Tomkins, M.R.
Nielsen, P.
Hughes, M.G.
Title Selective entrainment of sediment graded by size and density under waves
Journal name Journal of Sedimentary Research   Check publisher's open access policy
ISSN 1527-1404
Publication date 2003-11
Sub-type Article (original research)
DOI 10.1306/031703730906
Volume 73
Issue 6
Start page 906
End page 911
Total pages 6
Place of publication Tulsa, OK, United States
Publisher Society for Sedimentary Geology (S E P M)
Collection year 2003
Language eng
Subject 290802 Water and Sanitary Engineering
770402 Land and water management
Abstract The influence of near-bed sorting processes on heavy mineral content in suspension is discussed. Sediment concentrations above a rippled bed of mixed quartz and heavy mineral sand were measured under regular nonbreaking waves in the laboratory. Using the traditional gradient diffusion process, settling velocity would be expected to strongly affect sediment distribution. This was not observed during present trials. In fact, the vertical gradients of time-averaged suspension concentrations were found to be similar for the light and heavy minerals, despite their different settling velocities. This behavior implies a convective rather than diffusive distribution mechanism. Between the nonmoving bed and the lowest suspension sampling point, fight and heavy mineral concentration differs by two orders of magnitude. This discrimination against the heavy minerals in the pickup process is due largely to selective entrainment at the ripple face. Bed-form dynamics and the nature of quartz suspension profiles are found to be little affected by the trialed proportion of overall heavy minerals in the bed (3.8-22.1%).
Keyword Geology
Hydraulic Equivalence
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

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Created: Wed, 15 Aug 2007, 01:46:56 EST